I have been using procapture and in the settings I set the zoom function to the volume keys and its been real good for the last 2 weeks. Give that a try.
Also on the stock d3 camera using the volume keys for zoom in and out which I didn't know and its a default setting. I just don't like the lag when you take a photo so just down load procapture like I did and let me know as Im pretty happy so far.
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